linux-kernel - Re: Confusion in usr/include/asm-generic/fcntl.h

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Date:	Wed, 21 Jan 2009 08:44:56 -0800
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Sam Ravnborg <sam@...nborg.org>, Helge Deller <deller@....de>,
	David Miller <davem@...emloft.net>, jaswinder@...nel.org,
	mingo@...e.hu, x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-parisc@...r.kernel.org, Kyle McMartin <kyle@...artin.ca>
Subject: Re: Confusion in usr/include/asm-generic/fcntl.h

Arnd Bergmann wrote:
> 
> I would prefer using the __BITS_PER_LONG == 64 check directly, because
> it gives you a warning when __BITS_PER_LONG is undefined, whereas the
> #ifdef check gets easily fooled by include order problems. Note that
> this is not a problem in the kernel for CONFIG_* symbols which are
> always defined before the first #include.
> 

I fully agree with this.  It actually *is* a problem for CONFIG_*
symbols too, since people typo them all the time.

	-hpa
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